-/** \brief The default DW_TAG_lower_bound for a given DW_AT_language.
- *
- * The default for a given language is defined in the DWARF spec.
- *
- * \param language consant as defined by the DWARf spec
- */
-static uint64_t MC_dwarf_default_lower_bound(int lang);
-
-/** \brief Computes the the element_count of a DW_TAG_enumeration_type DIE
- *
- * This is the number of elements in a given array dimension.
- *
- * A reference of the compilation unit (DW_TAG_compile_unit) is
- * needed because the default lower bound (when there is no DW_AT_lower_bound)
- * depends of the language of the compilation unit (DW_AT_language).
- *
- * \param die DIE for the DW_TAG_enumeration_type or DW_TAG_subrange_type
- * \param unit DIE of the DW_TAG_compile_unit
- */
-static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die * die,
- Dwarf_Die * unit);
-
-/** \brief Computes the number of elements of a given DW_TAG_array_type.
- *
- * \param die DIE for the DW_TAG_array_type
- */
-static uint64_t MC_dwarf_array_element_count(Dwarf_Die * die, Dwarf_Die * unit);
-
-/** \brief Process a DIE
- *
- * \param info the resulting object fot the library/binary file (output)
- * \param die the current DIE
- * \param unit the DIE of the compile unit of the current DIE
- * \param frame containg frame if any
- */
-static void MC_dwarf_handle_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns);
-
-/** \brief Process a type DIE
- */
-static void MC_dwarf_handle_type_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns);
-
-/** \brief Calls MC_dwarf_handle_die on all childrend of the given die
- *
- * \param info the resulting object fot the library/binary file (output)
- * \param die the current DIE
- * \param unit the DIE of the compile unit of the current DIE
- * \param frame containg frame if any
- */
-static void MC_dwarf_handle_children(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns);
-
-/** \brief Handle a variable (DW_TAG_variable or other)
- *
- * \param info the resulting object fot the library/binary file (output)
- * \param die the current DIE
- * \param unit the DIE of the compile unit of the current DIE
- * \param frame containg frame if any
- */
-static void MC_dwarf_handle_variable_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns);
-
-/** \brief Get the DW_TAG_type of the DIE
- *
- * \param die DIE
- * \return DW_TAG_type attribute as a new string (NULL if none)
- */
-static std::uint64_t MC_dwarf_at_type(Dwarf_Die * die);
-
-/** \brief A class of DWARF tags (DW_TAG_*)
- */
-typedef enum mc_tag_class {
- mc_tag_unknown,
- mc_tag_type,
- mc_tag_subprogram,
- mc_tag_variable,
- mc_tag_scope,
- mc_tag_namespace
-} mc_tag_class;
-
-static mc_tag_class MC_dwarf_tag_classify(int tag)
-{
- switch (tag) {
-
- case DW_TAG_array_type:
- case DW_TAG_class_type:
- case DW_TAG_enumeration_type:
- case DW_TAG_typedef:
- case DW_TAG_pointer_type:
- case DW_TAG_reference_type:
- case DW_TAG_rvalue_reference_type:
- case DW_TAG_string_type:
- case DW_TAG_structure_type:
- case DW_TAG_subroutine_type:
- case DW_TAG_union_type:
- case DW_TAG_ptr_to_member_type:
- case DW_TAG_set_type:
- case DW_TAG_subrange_type:
- case DW_TAG_base_type:
- case DW_TAG_const_type:
- case DW_TAG_file_type:
- case DW_TAG_packed_type:
- case DW_TAG_volatile_type:
- case DW_TAG_restrict_type:
- case DW_TAG_interface_type:
- case DW_TAG_unspecified_type:
- case DW_TAG_shared_type:
- return mc_tag_type;
-
- case DW_TAG_subprogram:
- return mc_tag_subprogram;
-
- case DW_TAG_variable:
- case DW_TAG_formal_parameter:
- return mc_tag_variable;
-
- case DW_TAG_lexical_block:
- case DW_TAG_try_block:
- case DW_TAG_catch_block:
- case DW_TAG_inlined_subroutine:
- case DW_TAG_with_stmt:
- return mc_tag_scope;
-
- case DW_TAG_namespace:
- return mc_tag_namespace;
-
- default:
- return mc_tag_unknown;
-
- }
-}
-
-#define MC_DW_CLASS_UNKNOWN 0
-#define MC_DW_CLASS_ADDRESS 1 // Location in the address space of the program
-#define MC_DW_CLASS_BLOCK 2 // Arbitrary block of bytes
-#define MC_DW_CLASS_CONSTANT 3
-#define MC_DW_CLASS_STRING 3 // String
-#define MC_DW_CLASS_FLAG 4 // Boolean
-#define MC_DW_CLASS_REFERENCE 5 // Reference to another DIE
-#define MC_DW_CLASS_EXPRLOC 6 // DWARF expression/location description
-#define MC_DW_CLASS_LINEPTR 7
-#define MC_DW_CLASS_LOCLISTPTR 8
-#define MC_DW_CLASS_MACPTR 9
-#define MC_DW_CLASS_RANGELISTPTR 10
-
-/** \brief Find the DWARF data class for a given DWARF data form
- *
- * This mapping is defined in the DWARF spec.
- *
- * \param form The form (values taken from the DWARF spec)
- * \return An internal representation for the corresponding class
- * */
-static int MC_dwarf_form_get_class(int form)
-{
- switch (form) {
- case DW_FORM_addr:
- return MC_DW_CLASS_ADDRESS;
- case DW_FORM_block2:
- case DW_FORM_block4:
- case DW_FORM_block:
- case DW_FORM_block1:
- return MC_DW_CLASS_BLOCK;
- case DW_FORM_data1:
- case DW_FORM_data2:
- case DW_FORM_data4:
- case DW_FORM_data8:
- case DW_FORM_udata:
- case DW_FORM_sdata:
- return MC_DW_CLASS_CONSTANT;
- case DW_FORM_string:
- case DW_FORM_strp:
- return MC_DW_CLASS_STRING;
- case DW_FORM_ref_addr:
- case DW_FORM_ref1:
- case DW_FORM_ref2:
- case DW_FORM_ref4:
- case DW_FORM_ref8:
- case DW_FORM_ref_udata:
- return MC_DW_CLASS_REFERENCE;
- case DW_FORM_flag:
- case DW_FORM_flag_present:
- return MC_DW_CLASS_FLAG;
- case DW_FORM_exprloc:
- return MC_DW_CLASS_EXPRLOC;
- // TODO sec offset
- // TODO indirect
- default:
- return MC_DW_CLASS_UNKNOWN;
- }
-}
-
-/** \brief Get the name of the tag of a given DIE
- *
- * \param die DIE
- * \return name of the tag of this DIE
- */
-static inline const char *MC_dwarf_die_tagname(Dwarf_Die * die)
-{
- return MC_dwarf_tagname(dwarf_tag(die));
-}
-
-// ***** Attributes
-
-/** \brief Get an attribute of a given DIE as a string
- *
- * \param die the DIE
- * \param attribute attribute
- * \return value of the given attribute of the given DIE
- */
-static const char *MC_dwarf_attr_integrate_string(Dwarf_Die * die,
- int attribute)
-{
- Dwarf_Attribute attr;
- if (!dwarf_attr_integrate(die, attribute, &attr)) {
- return NULL;
- } else {
- return dwarf_formstring(&attr);
- }
-}
-
-/** \brief Get the linkage name of a DIE.
- *
- * Use either DW_AT_linkage_name or DW_AT_MIPS_linkage_name.
- * DW_AT_linkage_name is standardized since DWARF 4.
- * Before this version of DWARF, the MIPS extensions
- * DW_AT_MIPS_linkage_name is used (at least by GCC).
- *
- * \param the DIE
- * \return linkage name of the given DIE (or NULL)
- * */
-static const char *MC_dwarf_at_linkage_name(Dwarf_Die * die)
-{
- const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_linkage_name);
- if (!name)
- name = MC_dwarf_attr_integrate_string(die, DW_AT_MIPS_linkage_name);
- return name;
-}
-
-static Dwarf_Off MC_dwarf_attr_dieoffset(Dwarf_Die * die, int attribute)
-{
- Dwarf_Attribute attr;
- if (dwarf_hasattr_integrate(die, attribute) == 0)
- return 0;
- dwarf_attr_integrate(die, attribute, &attr);
- Dwarf_Die subtype_die;
- if (dwarf_formref_die(&attr, &subtype_die) == NULL)
- xbt_die("Could not find DIE");
- return dwarf_dieoffset(&subtype_die);
-}
-
-static Dwarf_Off MC_dwarf_attr_integrate_dieoffset(Dwarf_Die * die,
- int attribute)
-{
- Dwarf_Attribute attr;
- if (dwarf_hasattr_integrate(die, attribute) == 0)
- return 0;
- dwarf_attr_integrate(die, DW_AT_type, &attr);
- Dwarf_Die subtype_die;
- if (dwarf_formref_die(&attr, &subtype_die) == NULL)
- xbt_die("Could not find DIE");
- return dwarf_dieoffset(&subtype_die);
-}
-
-/** \brief Find the type/subtype (DW_AT_type) for a DIE
- *
- * \param dit the DIE
- * \return DW_AT_type reference as a global offset in hexadecimal (or NULL)
- */
-static
-std::uint64_t MC_dwarf_at_type(Dwarf_Die * die)
-{
- return MC_dwarf_attr_integrate_dieoffset(die, DW_AT_type);
-}
-
-static uint64_t MC_dwarf_attr_integrate_addr(Dwarf_Die * die, int attribute)
-{
- Dwarf_Attribute attr;
- if (dwarf_attr_integrate(die, attribute, &attr) == NULL)
- return 0;
- Dwarf_Addr value;
- if (dwarf_formaddr(&attr, &value) == 0)
- return (uint64_t) value;
- else
- return 0;
-}
-
-static uint64_t MC_dwarf_attr_integrate_uint(Dwarf_Die * die, int attribute,
- uint64_t default_value)
-{
- Dwarf_Attribute attr;
- if (dwarf_attr_integrate(die, attribute, &attr) == NULL)
- return default_value;
- Dwarf_Word value;
- return dwarf_formudata(dwarf_attr_integrate(die, attribute, &attr),
- &value) == 0 ? (uint64_t) value : default_value;
-}
-
-static bool MC_dwarf_attr_flag(Dwarf_Die * die, int attribute, bool integrate)
-{
- Dwarf_Attribute attr;
- if ((integrate ? dwarf_attr_integrate(die, attribute, &attr)
- : dwarf_attr(die, attribute, &attr)) == 0)
- return false;
-
- bool result;
- if (dwarf_formflag(&attr, &result))
- xbt_die("Unexpected form for attribute %s", MC_dwarf_attrname(attribute));
- return result;
-}
-
-/** \brief Find the default lower bound for a given language
- *
- * The default lower bound of an array (when DW_TAG_lower_bound
- * is missing) depends on the language of the compilation unit.
- *
- * \param lang Language of the compilation unit (values defined in the DWARF spec)
- * \return Default lower bound of an array in this compilation unit
- * */
-static uint64_t MC_dwarf_default_lower_bound(int lang)
-{
- switch (lang) {
- case DW_LANG_C:
- case DW_LANG_C89:
- case DW_LANG_C99:
- case DW_LANG_C_plus_plus:
- case DW_LANG_D:
- case DW_LANG_Java:
- case DW_LANG_ObjC:
- case DW_LANG_ObjC_plus_plus:
- case DW_LANG_Python:
- case DW_LANG_UPC:
- return 0;
- case DW_LANG_Ada83:
- case DW_LANG_Ada95:
- case DW_LANG_Fortran77:
- case DW_LANG_Fortran90:
- case DW_LANG_Fortran95:
- case DW_LANG_Modula2:
- case DW_LANG_Pascal83:
- case DW_LANG_PL1:
- case DW_LANG_Cobol74:
- case DW_LANG_Cobol85:
- return 1;
- default:
- xbt_die("No default DW_TAG_lower_bound for language %i and none given",
- lang);
- return 0;
- }
-}
-
-/** \brief Finds the number of elements in a DW_TAG_subrange_type or DW_TAG_enumeration_type DIE
- *
- * \param die the DIE
- * \param unit DIE of the compilation unit
- * \return number of elements in the range
- * */
-static uint64_t MC_dwarf_subrange_element_count(Dwarf_Die * die,
- Dwarf_Die * unit)
-{
- xbt_assert(dwarf_tag(die) == DW_TAG_enumeration_type
- || dwarf_tag(die) == DW_TAG_subrange_type,
- "MC_dwarf_subrange_element_count called with DIE of type %s",
- MC_dwarf_die_tagname(die));
-
- // Use DW_TAG_count if present:
- if (dwarf_hasattr_integrate(die, DW_AT_count))
- return MC_dwarf_attr_integrate_uint(die, DW_AT_count, 0);
- // Otherwise compute DW_TAG_upper_bound-DW_TAG_lower_bound + 1:
-
- if (!dwarf_hasattr_integrate(die, DW_AT_upper_bound))
- // This is not really 0, but the code expects this (we do not know):
- return 0;
-
- uint64_t upper_bound =
- MC_dwarf_attr_integrate_uint(die, DW_AT_upper_bound, -1);
-
- uint64_t lower_bound = 0;
- if (dwarf_hasattr_integrate(die, DW_AT_lower_bound))
- lower_bound = MC_dwarf_attr_integrate_uint(die, DW_AT_lower_bound, -1);
- else
- lower_bound = MC_dwarf_default_lower_bound(dwarf_srclang(unit));
- return upper_bound - lower_bound + 1;
-}
-
-/** \brief Finds the number of elements in a array type (DW_TAG_array_type)
- *
- * The compilation unit might be needed because the default lower
- * bound depends on the language of the compilation unit.
- *
- * \param die the DIE of the DW_TAG_array_type
- * \param unit the DIE of the compilation unit
- * \return number of elements in this array type
- * */
-static uint64_t MC_dwarf_array_element_count(Dwarf_Die * die, Dwarf_Die * unit)
-{
- xbt_assert(dwarf_tag(die) == DW_TAG_array_type,
- "MC_dwarf_array_element_count called with DIE of type %s",
- MC_dwarf_die_tagname(die));
-
- int result = 1;
- Dwarf_Die child;
- int res;
- for (res = dwarf_child(die, &child); res == 0;
- res = dwarf_siblingof(&child, &child)) {
- int child_tag = dwarf_tag(&child);
- if (child_tag == DW_TAG_subrange_type
- || child_tag == DW_TAG_enumeration_type)
- result *= MC_dwarf_subrange_element_count(&child, unit);
- }
- return result;
-}
-
-// ***** Variable
-
-/** Sort the variable by name and address.
- *
- * We could use boost::container::flat_set instead.
- */
-static bool MC_compare_variable(
- simgrid::mc::Variable const& a, simgrid::mc::Variable const& b)
-{
- int cmp = strcmp(a.name.c_str(), b.name.c_str());
- if (cmp < 0)
- return true;
- else if (cmp > 0)
- return false;
- else
- return a.address < b.address;
-}
-
-// ***** simgrid::mc::Type*
-
-/** \brief Initialize the location of a member of a type
- * (DW_AT_data_member_location of a DW_TAG_member).
- *
- * \param type a type (struct, class)
- * \param member the member of the type
- * \param child DIE of the member (DW_TAG_member)
- */
-static void MC_dwarf_fill_member_location(simgrid::mc::Type* type, simgrid::mc::Type* member,
- Dwarf_Die * child)
-{
- if (dwarf_hasattr(child, DW_AT_data_bit_offset))
- xbt_die("Can't groke DW_AT_data_bit_offset.");
-
- if (!dwarf_hasattr_integrate(child, DW_AT_data_member_location)) {
- if (type->type == DW_TAG_union_type)
- return;
- xbt_die
- ("Missing DW_AT_data_member_location field in DW_TAG_member %s of type <%"
- PRIx64 ">%s", member->name.c_str(),
- (uint64_t) type->id, type->name.c_str());
- }
-
- Dwarf_Attribute attr;
- dwarf_attr_integrate(child, DW_AT_data_member_location, &attr);
- int form = dwarf_whatform(&attr);
- int klass = MC_dwarf_form_get_class(form);
- switch (klass) {
- case MC_DW_CLASS_EXPRLOC:
- case MC_DW_CLASS_BLOCK:
- // Location expression:
- {
- Dwarf_Op *expr;
- size_t len;
- if (dwarf_getlocation(&attr, &expr, &len))
- xbt_die
- ("Could not read location expression DW_AT_data_member_location in DW_TAG_member %s of type <%"
- PRIx64 ">%s", MC_dwarf_attr_integrate_string(child, DW_AT_name),
- (uint64_t) type->id, type->name.c_str());
- simgrid::mc::DwarfExpression(expr, expr+len);
- break;
- }
- case MC_DW_CLASS_CONSTANT:
- // Offset from the base address of the object:
- {
- Dwarf_Word offset;
- if (!dwarf_formudata(&attr, &offset))
- member->offset(offset);
- else
- xbt_die("Cannot get %s location <%" PRIx64 ">%s",
- MC_dwarf_attr_integrate_string(child, DW_AT_name),
- (uint64_t) type->id, type->name.c_str());
- break;
- }
- case MC_DW_CLASS_LOCLISTPTR:
- // Reference to a location list:
- // TODO
- case MC_DW_CLASS_REFERENCE:
- // It's supposed to be possible in DWARF2 but I couldn't find its semantic
- // in the spec.
- default:
- xbt_die("Can't handle form class (%i) / form 0x%x as DW_AT_member_location",
- klass, form);
- }
-
-}
-
-/** \brief Populate the list of members of a type
- *
- * \param info ELF object containing the type DIE
- * \param die DIE of the type
- * \param unit DIE of the compilation unit containing the type DIE
- * \param type the type
- */
-static void MC_dwarf_add_members(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Type* type)
-{
- int res;
- Dwarf_Die child;
- xbt_assert(type->members.empty());
- for (res = dwarf_child(die, &child); res == 0;
- res = dwarf_siblingof(&child, &child)) {
- int tag = dwarf_tag(&child);
- if (tag == DW_TAG_member || tag == DW_TAG_inheritance) {
-
- // Skip declarations:
- if (MC_dwarf_attr_flag(&child, DW_AT_declaration, false))
- continue;
-
- // Skip compile time constants:
- if (dwarf_hasattr(&child, DW_AT_const_value))
- continue;
-
- // TODO, we should use another type (because is is not a type but a member)
- simgrid::mc::Type member;
- member.type = tag;
-
- // Global Offset:
- member.id = dwarf_dieoffset(&child);
-
- const char *name = MC_dwarf_attr_integrate_string(&child, DW_AT_name);
- if (name)
- member.name = name;
- member.byte_size =
- MC_dwarf_attr_integrate_uint(&child, DW_AT_byte_size, 0);
- member.element_count = -1;
- member.type_id = MC_dwarf_at_type(&child);
-
- if (dwarf_hasattr(&child, DW_AT_data_bit_offset))
- xbt_die("Can't groke DW_AT_data_bit_offset.");
-
- MC_dwarf_fill_member_location(type, &member, &child);
-
- if (!member.type_id)
- xbt_die("Missing type for member %s of <%" PRIx64 ">%s",
- member.name.c_str(),
- (uint64_t) type->id, type->name.c_str());
-
- type->members.push_back(std::move(member));
- }
- }
-}
-
-/** \brief Create a MC type object from a DIE
- *
- * \param info current object info object
- * \param DIE (for a given type);
- * \param unit compilation unit of the current DIE
- * \return MC representation of the type
- */
-static simgrid::mc::Type MC_dwarf_die_to_type(
- simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns)
-{
- simgrid::mc::Type type;
- type.type = dwarf_tag(die);
- type.name = std::string();
- type.element_count = -1;
-
- // Global Offset
- type.id = dwarf_dieoffset(die);
-
- const char *prefix = "";
- switch (type.type) {
- case DW_TAG_structure_type:
- prefix = "struct ";
- break;
- case DW_TAG_union_type:
- prefix = "union ";
- break;
- case DW_TAG_class_type:
- prefix = "class ";
- break;
- default:
- prefix = "";
- }
-
- const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
- if (name != NULL) {
- char* full_name = ns ? bprintf("%s%s::%s", prefix, ns, name) :
- bprintf("%s%s", prefix, name);
- type.name = std::string(full_name);
- free(full_name);
- }
-
- type.type_id = MC_dwarf_at_type(die);
-
- // Some compilers do not emit DW_AT_byte_size for pointer_type,
- // so we fill this. We currently assume that the model-checked process is in
- // the same architecture..
- if (type.type == DW_TAG_pointer_type)
- type.byte_size = sizeof(void*);
-
- // Computation of the byte_size;
- if (dwarf_hasattr_integrate(die, DW_AT_byte_size))
- type.byte_size = MC_dwarf_attr_integrate_uint(die, DW_AT_byte_size, 0);
- else if (type.type == DW_TAG_array_type
- || type.type == DW_TAG_structure_type
- || type.type == DW_TAG_class_type) {
- Dwarf_Word size;
- if (dwarf_aggregate_size(die, &size) == 0)
- type.byte_size = size;
- }
-
- switch (type.type) {
- case DW_TAG_array_type:
- type.element_count = MC_dwarf_array_element_count(die, unit);
- // TODO, handle DW_byte_stride and (not) DW_bit_stride
- break;
-
- case DW_TAG_pointer_type:
- case DW_TAG_reference_type:
- case DW_TAG_rvalue_reference_type:
- type.is_pointer_type = 1;
- break;
-
- case DW_TAG_structure_type:
- case DW_TAG_union_type:
- case DW_TAG_class_type:
- MC_dwarf_add_members(info, die, unit, &type);
- char *new_ns = ns == NULL ? xbt_strdup(type.name.c_str())
- : bprintf("%s::%s", ns, name);
- MC_dwarf_handle_children(info, die, unit, frame, new_ns);
- free(new_ns);
- break;
- }
-
- return std::move(type);
-}
-
-static void MC_dwarf_handle_type_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns)
-{
- simgrid::mc::Type type = MC_dwarf_die_to_type(info, die, unit, frame, ns);
- auto& t = (info->types[type.id] = std::move(type));
- if (!t.name.empty() && type.byte_size != 0)
- info->full_types_by_name[t.name] = &t;
-}
-
-static int mc_anonymous_variable_index = 0;
-
-static std::unique_ptr<simgrid::mc::Variable> MC_die_to_variable(
- simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns)
-{
- // Skip declarations:
- if (MC_dwarf_attr_flag(die, DW_AT_declaration, false))
- return nullptr;
-
- // Skip compile time constants:
- if (dwarf_hasattr(die, DW_AT_const_value))
- return nullptr;
-
- Dwarf_Attribute attr_location;
- if (dwarf_attr(die, DW_AT_location, &attr_location) == NULL)
- // No location: do not add it ?
- return nullptr;
-
- std::unique_ptr<simgrid::mc::Variable> variable =
- std::unique_ptr<simgrid::mc::Variable>(new simgrid::mc::Variable());
- variable->dwarf_offset = dwarf_dieoffset(die);
- variable->global = frame == NULL; // Can be override base on DW_AT_location
- variable->object_info = info;
-
- const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
- if (name)
- variable->name = name;
- variable->type_id = MC_dwarf_at_type(die);
-
- int form = dwarf_whatform(&attr_location);
- int klass =
- form ==
- DW_FORM_sec_offset ? MC_DW_CLASS_CONSTANT : MC_dwarf_form_get_class(form);
- switch (klass) {
- case MC_DW_CLASS_EXPRLOC:
- case MC_DW_CLASS_BLOCK:
- // Location expression:
- {
- Dwarf_Op *expr;
- size_t len;
- if (dwarf_getlocation(&attr_location, &expr, &len)) {
- xbt_die(
- "Could not read location expression in DW_AT_location "
- "of variable <%" PRIx64 ">%s",
- (uint64_t) variable->dwarf_offset,
- variable->name.c_str());
- }
-
- if (len == 1 && expr[0].atom == DW_OP_addr) {
- variable->global = 1;
- uintptr_t offset = (uintptr_t) expr[0].number;
- uintptr_t base = (uintptr_t) info->base_address();
- variable->address = (void *) (base + offset);
- } else {
- simgrid::mc::LocationListEntry entry;
- entry.expression = {expr, expr + len};
- variable->location_list = { std::move(entry) };
- }
-
- break;
- }
- case MC_DW_CLASS_LOCLISTPTR:
- case MC_DW_CLASS_CONSTANT:
- // Reference to location list:
- mc_dwarf_location_list_init(
- &variable->location_list, info, die,
- &attr_location);
- break;
- default:
- xbt_die("Unexpected form 0x%x (%i), class 0x%x (%i) list for location "
- "in <%" PRIx64 ">%s",
- form, form, klass, klass,
- (uint64_t) variable->dwarf_offset,
- variable->name.c_str());
- }
-
- // Handle start_scope:
- if (dwarf_hasattr(die, DW_AT_start_scope)) {
- Dwarf_Attribute attr;
- dwarf_attr(die, DW_AT_start_scope, &attr);
- int form = dwarf_whatform(&attr);
- int klass = MC_dwarf_form_get_class(form);
- switch (klass) {
- case MC_DW_CLASS_CONSTANT:
- {
- Dwarf_Word value;
- variable->start_scope =
- dwarf_formudata(&attr, &value) == 0 ? (size_t) value : 0;
- break;
- }
- case MC_DW_CLASS_RANGELISTPTR: // TODO
- default:
- xbt_die
- ("Unhandled form 0x%x, class 0x%X for DW_AT_start_scope of variable %s",
- form, klass, name == NULL ? "?" : name);
- }
- }
-
- if (ns && variable->global)
- variable->name =
- std::string(ns) + "::" + variable->name;
-
- // The current code needs a variable name,
- // generate a fake one:
- if (variable->name.empty())
- variable->name =
- "@anonymous#" + std::to_string(mc_anonymous_variable_index++);
-
- return std::move(variable);
-}
-
-static void MC_dwarf_handle_variable_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns)
-{
- std::unique_ptr<simgrid::mc::Variable> variable =
- MC_die_to_variable(info, die, unit, frame, ns);
- if (!variable)
- return;
- // Those arrays are sorted later:
- else if (variable->global)
- info->global_variables.push_back(std::move(*variable));
- else if (frame != nullptr)
- frame->variables.push_back(std::move(*variable));
- else
- xbt_die("No frame for this local variable");
-}
-
-static void MC_dwarf_handle_scope_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* parent_frame,
- const char *ns)
-{
- // TODO, handle DW_TAG_type/DW_TAG_location for DW_TAG_with_stmt
- int tag = dwarf_tag(die);
- mc_tag_class klass = MC_dwarf_tag_classify(tag);
-
- // (Template) Subprogram declaration:
- if (klass == mc_tag_subprogram
- && MC_dwarf_attr_flag(die, DW_AT_declaration, false))
- return;
-
- if (klass == mc_tag_scope)
- xbt_assert(parent_frame, "No parent scope for this scope");
-
- simgrid::mc::Frame frame;
-
- frame.tag = tag;
- frame.id = dwarf_dieoffset(die);
- frame.object_info = info;
-
- if (klass == mc_tag_subprogram) {
- const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
- if(ns)
- frame.name = std::string(ns) + "::" + name;
- else if (name)
- frame.name = name;
- else
- frame.name.clear();
- }
-
- frame.abstract_origin_id =
- MC_dwarf_attr_dieoffset(die, DW_AT_abstract_origin);
-
- // This is the base address for DWARF addresses.
- // Relocated addresses are offset from this base address.
- // See DWARF4 spec 7.5
- void *base = info->base_address();
-
- // TODO, support DW_AT_ranges
- uint64_t low_pc = MC_dwarf_attr_integrate_addr(die, DW_AT_low_pc);
- frame.low_pc = low_pc ? ((char *) base) + low_pc : 0;
- if (low_pc) {
- // DW_AT_high_pc:
- Dwarf_Attribute attr;
- if (!dwarf_attr_integrate(die, DW_AT_high_pc, &attr)) {
- xbt_die("Missing DW_AT_high_pc matching with DW_AT_low_pc");
- }
-
- Dwarf_Sword offset;
- Dwarf_Addr high_pc;
-
- switch (MC_dwarf_form_get_class(dwarf_whatform(&attr))) {
-
- // DW_AT_high_pc if an offset from the low_pc:
- case MC_DW_CLASS_CONSTANT:
-
- if (dwarf_formsdata(&attr, &offset) != 0)
- xbt_die("Could not read constant");
- frame.high_pc = (void *) ((char *) frame.low_pc + offset);
- break;
-
- // DW_AT_high_pc is a relocatable address:
- case MC_DW_CLASS_ADDRESS:
- if (dwarf_formaddr(&attr, &high_pc) != 0)
- xbt_die("Could not read address");
- frame.high_pc = ((char *) base) + high_pc;
- break;
-
- default:
- xbt_die("Unexpected class for DW_AT_high_pc");
-
- }
- }
-
- if (klass == mc_tag_subprogram) {
- Dwarf_Attribute attr_frame_base;
- if (dwarf_attr_integrate(die, DW_AT_frame_base, &attr_frame_base))
- mc_dwarf_location_list_init(&frame.frame_base, info, die,
- &attr_frame_base);
- }
-
- // Handle children:
- MC_dwarf_handle_children(info, die, unit, &frame, ns);
-
- // Someone needs this to be sorted but who?
- std::sort(frame.variables.begin(), frame.variables.end(),
- MC_compare_variable);
-
- // Register it:
- if (klass == mc_tag_subprogram)
- info->subprograms[frame.id] = frame;
- else if (klass == mc_tag_scope)
- parent_frame->scopes.push_back(std::move(frame));
-}
-
-static void mc_dwarf_handle_namespace_die(simgrid::mc::ObjectInformation* info,
- Dwarf_Die * die, Dwarf_Die * unit,
- simgrid::mc::Frame* frame,
- const char *ns)
-{
- const char *name = MC_dwarf_attr_integrate_string(die, DW_AT_name);
- if (frame)
- xbt_die("Unexpected namespace in a subprogram");
- char *new_ns = ns == NULL ? xbt_strdup(name)
- : bprintf("%s::%s", ns, name);
- MC_dwarf_handle_children(info, die, unit, frame, new_ns);
- xbt_free(new_ns);
-}
-
-static void MC_dwarf_handle_children(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns)
-{
- // For each child DIE:
- Dwarf_Die child;
- int res;
- for (res = dwarf_child(die, &child); res == 0;
- res = dwarf_siblingof(&child, &child)) {
- MC_dwarf_handle_die(info, &child, unit, frame, ns);
- }
-}
-
-static void MC_dwarf_handle_die(simgrid::mc::ObjectInformation* info, Dwarf_Die * die,
- Dwarf_Die * unit, simgrid::mc::Frame* frame,
- const char *ns)
-{
- int tag = dwarf_tag(die);
- mc_tag_class klass = MC_dwarf_tag_classify(tag);
- switch (klass) {
-
- // Type:
- case mc_tag_type:
- MC_dwarf_handle_type_die(info, die, unit, frame, ns);
- break;
-
- // Subprogram or scope:
- case mc_tag_subprogram:
- case mc_tag_scope:
- MC_dwarf_handle_scope_die(info, die, unit, frame, ns);
- return;
-
- // Variable:
- case mc_tag_variable:
- MC_dwarf_handle_variable_die(info, die, unit, frame, ns);
- break;
-
- case mc_tag_namespace:
- mc_dwarf_handle_namespace_die(info, die, unit, frame, ns);
- break;
-
- default:
- break;
-
- }
-}
-
-/** \brief Populate the debugging informations of the given ELF object
- *
- * Read the DWARf information of the EFFL object and populate the
- * lists of types, variables, functions.
- */
-void MC_dwarf_get_variables(simgrid::mc::ObjectInformation* info)
-{
- int fd = open(info->file_name.c_str(), O_RDONLY);
- if (fd < 0)
- xbt_die("Could not open file %s", info->file_name.c_str());
- Dwarf *dwarf = dwarf_begin(fd, DWARF_C_READ);
- if (dwarf == NULL)
- xbt_die("Missing debugging information in %s\n"
- "Your program and its dependencies must have debugging information.\n"
- "You might want to recompile with -g or install the suitable debugging package.\n",
- info->file_name.c_str());
- // For each compilation unit:
- Dwarf_Off offset = 0;
- Dwarf_Off next_offset = 0;
- size_t length;
-
- while (dwarf_nextcu(dwarf, offset, &next_offset, &length, NULL, NULL, NULL) ==
- 0) {
- Dwarf_Die unit_die;
- if (dwarf_offdie(dwarf, offset + length, &unit_die) != NULL)
- MC_dwarf_handle_children(info, &unit_die, &unit_die, NULL, NULL);
- offset = next_offset;
- }
-
- dwarf_end(dwarf);
- close(fd);
-}
-
